Centrifugal fan.



PATENTED JAN. 28, 1908.

J. KEITH.

GENTRIFUGAL PAN.

APPLICAIION FILED MAY 18.1907.

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PATBNTED JAN. 28, 1908. J KEITH GENTRIPUGAL PAN.

APPLICATION FILED MAY 18 1907 ZSHBETS-SHEET 2.

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PATENTED JAN. 28, 1908.

J. KEITH. OENTRIFUGAL PAN. APPLICATION FILED MAY 18,1907.

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flttornea as in the construction described in the Patent of t e fan blades and the mode of mounting JAMES KEITH, OF LONDON, ENGLAND.

CENTRIFUGAL FAN.

Specification of Letters Patent.-

Patented Jan. 28, 1908.

Application filed May 13. 1907- flerial No. 374.408.

To all whom it may concern:

Be it known that I, JAMES KEITH, a subject of the King of the United Kingdom of GreatBritain and Ireland, residing at Lon don, En land, have invented certain new and usefu l Improvements in Centrifugal Fans, of which the following is a specification.

This invention is a development of that described in the specification of Letters Patent No. 847585, and it has for its object to trifugal fan of the type referred to therein but having a-single inlet and adapted more particularly for suction or exhausting urposes such for exam le as for drawing 'ofl hot gases in induced'ifiaft furnaces, in which case it is desirable to avoid overheating of the bearings in which the fan spindle runs, as also to avoid overheating of the driving motor when the fan is electrically driven.

The fan spindle is carried in hollow journal bearings through which water is circulated forcooling pur oses while the driving motor may, if desire be brought close. up to one side of the fan casing which has as'mgle inlet eye on the opposite sid ul'rhc inlet eye and I t e fan whee eing each formed with nerd i cheeks or rings as described in PM NO- 847585, but only on one side.

In the accompanying drawings Fig-was 1 and 2 are vertical sections at right angles to each other showing one construction of the i fan in which a water jacket is fitted around i the fan 5 indle and interposed between Hie; fan whee and driving motor while Fig. 3 is :1 vertical section showing a modification in which the water jacket is omitted and the dri pulley or motor is at some distant-c from t e fan casing. i

As therein shown the fan casing A is made i inone piece and is fitted with a singlejinlet l eye piece B having an inturned guard cheek I B while on the opposite side of the casing is secured a central casting (3 which carries the journal bearings D for the spindle E on which 5 is keyed the fan wheel F. The blades of the latter are secured to a central boss (i of the l curved formation shown leaving a non-conl ducting air space H between it and the rear casting C of the casing. At the inlet side adjacent the guard cheek B and closely fitting it a guard ring F is secured around the blades S ecial attention is drawn to the formation above indicated it is usually I pecially in the case of an electrically driven the same/as illustrated in the drawi s inasmuch as the efliciency of the fan epends largely on these features.

As shown, four of the fan blades (or the driving arms) arecarried down the face of the curved central boss G and secured by boss G.

.such as to be liab e to afiect the insulation of the motor it is preferred to employ an extended shaft and to mount the motor at some distance from the fan, an additional bracket serving to support the shaft as indicated in Fig. 3.

The water jacket is not essential but as preferred esfan.

in order that the fan may be caused to direct a blast in any desireddirection the inn ,casing may be rotated around an axis coinciding with the axis of the shaft and is changeable bolts 0 arranged in a ring, as is cnstonniry in centrifugal pumps -:(Fig.- 3).

I laying now described my invention what I claim and desire to secure by Letters Patent of the United States is The herein described centrifugal fan, comprising, in combination a fan casing made in one piece and having a single centre intake eye and a tangential outlet andi secured to the casting C by means of inter- In testimony whereof I have signed m spindle carrying said wheel journal bearings name to this specification in the presence of for said spindle, said bea'm'ngs supported by" said castin a. motor having its rotarymemtwo subscribing'witnesses. her see to said spindle and its stator se- JAMES KEITH. 5 cured to said casting, and a water jacketing Witnessw:

device formed in the and interposed I WALLACE CRANSTON- FAIBWEATHER, between the fan casing and e motor. J N0. Am'ls'mono', Junr. 

